CN109403901B - Drilling fluid channel structure of core drilling machine - Google Patents
Drilling fluid channel structure of core drilling machine Download PDFInfo
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- CN109403901B CN109403901B CN201811327013.4A CN201811327013A CN109403901B CN 109403901 B CN109403901 B CN 109403901B CN 201811327013 A CN201811327013 A CN 201811327013A CN 109403901 B CN109403901 B CN 109403901B
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- 239000012530 fluid Substances 0.000 title claims abstract description 58
- 238000005553 drilling Methods 0.000 title claims abstract description 51
- 230000000903 blocking effect Effects 0.000 claims abstract description 26
- 239000011229 interlayer Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 147
- 238000007789 sealing Methods 0.000 claims description 82
- 239000000110 cooling liquid Substances 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims 4
- 230000008676 import Effects 0.000 claims 3
- 239000002775 capsule Substances 0.000 claims 1
- 239000012809 cooling fluid Substances 0.000 abstract description 12
- 238000010008 shearing Methods 0.000 description 20
- 239000011435 rock Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 241001136800 Anas acuta Species 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- -1 researching stratum Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/605—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a core-bit
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/10—Formed core retaining or severing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
Abstract
The invention discloses a drilling fluid channel structure of a core drilling machine, which comprises a fluid channel starting module, a pressure relief module, a flow dividing and flow blocking module, a driving fluid channel and a cooling fluid channel, wherein the fluid channel starting module, the pressure relief module and the flow dividing and flow blocking module are sequentially connected from back to front, the driving fluid channel and the cooling fluid channel are connected with the flow dividing and flow blocking module at the rear, the driving fluid channel comprises a driving section, the driving section is arranged between a driving motor stator and a rotor, the driving fluid channel is provided with a driving fluid outlet, the driving fluid outlet is arranged in front of the driving section, the cooling fluid channel passes through an interlayer between a fidelity cabin and an outer cylinder, the front end of the outer cylinder is connected with a drill bit, and the front end of the cooling fluid channel is opened at the drill bit. The drilling fluid channel structure of the core drilling machine can drive the motor to rotate the drill bit, cool the rotating drill bit, control the motor to start and stop, and automatically release pressure after the motor stops.
Description
Technical Field
The invention relates to a drilling coring system, in particular to a drilling fluid channel structure of a coring drilling machine.
Background
In the process of oil field exploration, a rock core is important data for finding an oil-gas layer, researching stratum, oil producing layer, oil storage layer, cover layer, structure and the like, and the lithology, physical property, oil content, gas content and aquatic characteristic of the underground rock stratum can be directly known through observation and research on the rock core. After the oil field is put into development, the deposition characteristics of the oil layer are further researched and known through the rock core, and the physical properties, pore structure, wettability, relative permeability and lithofacies characteristics of the oil layer are further researched, and the physical simulation and flooding rules of the oil layer are realized; the oil layer flooding characteristics of different development stages and different water-containing stages are recognized and mastered, the distribution of residual oil is cleared, and scientific basis is provided for the design of oil field development schemes, the adjustment of layers and well patterns and the encryption of wells.
The core taking is to take underground rock to the ground by using a special coring tool in the drilling process, and the agglomerated rock is called a core, so that various properties of the rock can be measured, the underground structure and the rock deposition environment can be intuitively studied, and the fluid properties and the like can be known. In mineral exploration and development, geological formation layers and depths are needed to be designed according to geology, drilling work is carried out, a coring tool is put into a well, and a rock sample is taken out.
The underground temperature is high, the electrical equipment cannot be used, hydraulic equipment is often used, a liquid flow channel is required to be blocked before the hydraulic equipment is started, the liquid flow channel is smooth after the hydraulic equipment is started, hydraulic pressure is provided for a working section piece, a hydraulic motor is driven, and a drill bit of a drilling machine is cooled.
Disclosure of Invention
The invention aims to provide a drilling fluid channel structure of a core drilling machine, which can drive a motor to rotate a drill bit, cool the rotated drill bit, control the start and stop of the motor, and automatically release pressure after the motor stops.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a drilling fluid channel structure of a core drilling machine, which comprises a fluid channel starting module, a pressure relief module, a flow dividing and flow blocking module, a driving fluid channel and a cooling fluid channel, wherein the fluid channel starting module, the pressure relief module and the flow dividing and flow blocking module are sequentially connected from back to front, the rear of the driving fluid channel and the cooling fluid channel is connected with the flow dividing and flow blocking module, the driving fluid channel comprises a driving section, the driving section is arranged between a driving motor stator and a rotor, the driving fluid channel is provided with a driving fluid outlet, the driving fluid outlet is arranged in front of the driving section, the cooling fluid channel passes through an interlayer between a fidelity cabin and an outer barrel, the front end of the outer barrel is connected with a drill bit, and the front end of the cooling fluid channel is opened at the drill bit.
Further, the hydraulic flow control device further comprises a center rod rear section, the center rod rear section penetrates through the hydraulic flow control device starting module, the pressure relief module and the diversion and flow blocking module, the hydraulic flow control device starting module comprises a lock body, a locking rod and a starting shear pin, the locking rod is arranged in the lock body, the locking rod is connected with the lock body through the starting shear pin, the center rod rear section is arranged in the locking rod, the lock body comprises a sealing section A, the locking rod comprises a sealing section B, the sealing section A is in sealing fit with the sealing section B, the sealing section B is in sealing fit with the center rod rear section, a hydraulic flow control device A is arranged between the center rod rear section and the locking rod, an opening is arranged at the rear end of the locking rod, an outflow hole A is communicated with the hydraulic flow control device A, the outflow hole A is arranged behind the sealing section B, a hydraulic flow control device B is arranged between the lock body and the locking rod, the hydraulic flow control device B is arranged in front of the sealing section A, an outflow hole A outlet is arranged at the sealing section A, the front end of the hydraulic flow control device A is sealed after the starting shear pin is cut off, the locking rod is forwards moved, the outflow hole A outlet is arranged in front of the sealing section A, and the outflow hole A is communicated with the outflow hole A through the outflow hole A.
Further, the diversion and flow blocking module comprises a valve shell, a lock shell and a triggering mechanism, wherein the rear section of the central rod penetrates through the inner cavity of the valve shell, the valve shell is arranged in the lock shell, the valve shell comprises a sealing section C and a flow guiding section from back to front, the lock shell comprises an inflow section B and an outflow section B from back to front, a liquid channel D is arranged between the rear section of the central rod and the inflow section B, a liquid channel E is arranged between the outer wall of the rear section of the central rod and the inner wall of the valve shell, the rear end of the liquid channel D is communicated with the liquid channel B, the liquid channel E is communicated with the liquid channel D, the liquid channel E is communicated with a cooling liquid channel, the inner diameter of the inflow section B is larger than the outer diameter of the sealing section C, the outer diameter of the sealing section C is larger than the outer diameter of the flow guiding section, the inner diameter of the outflow section B is equal to the outer diameter of the sealing section C, the outflow section B is provided with an outflow hole B, the sealing section C is communicated with the driving liquid channel before drilling is stopped, the sealing section C is communicated with the outflow hole B, and the sealing section C is sealed and is separated from the outflow hole B.
Further, the valve casing still includes locking section A, and locking section A is connected with the water conservancy diversion section front end, the lock shell still includes locking section B, and locking section B links to each other with section B front end, trigger mechanism includes lock sleeve, solid fixed ring and safety gear, and the lock sleeve is in the urceolus, and the lock shell passes the lock sleeve inner chamber, and the urceolus inner wall even has the safety gear, locking section A outer wall is opened there is locking groove A, has locking hole A on the locking section B, and locking hole A is the through-hole, has the locking ball in the locking hole A, and locking ball diameter is greater than locking hole A degree of depth, and the lock sleeve is by the back to the front including impact section and locking section C, and locking section C inner wall has locking groove B, gu fixed ring fixes in locking section B outer wall, gu the fixed ring is in locking hole A rear, and impact section internal diameter is greater than gu fixed ring external diameter, and the safety gear is by the back to the front including chucking portion and extrusion portion, and the terminal surface internal diameter is less than impact section external diameter, extrusion portion internal diameter is not less than gu fixed ring external diameter, chucking portion terminal surface internal diameter is less than solid fixed ring terminal surface, and locking portion terminal surface internal diameter is less than fixed ring terminal surface A, and the axial direction is stopped the axial distance of the axial direction is equal to the axial direction is stopped at the front end of the axial direction is to the front end of the axial direction is stopped at the front end of the axial direction is to the front end of the locking section C that is stopped at the axial direction is stopped at the front end of the axial end that is stopped at the axial end is to the front end is to the axial end is to the end that is stopped at the axial end is stopped at the front end.
Further, the front end of the limiting head is connected with a front section of the central rod, a liquid channel F is axially arranged in the front section of the central rod, the limiting head is provided with a cooling liquid inlet, the liquid channel E is communicated with the liquid channel F through the cooling liquid inlet, the front end of the front section of the central rod is sealed, the front end of the front section of the central rod is connected with a fidelity cabin, the front section of the central rod and the fidelity cabin are both arranged in an outer cylinder, the side wall of the front end of the front section of the central rod is provided with a cooling liquid outlet, a liquid channel G is arranged in an interlayer between the fidelity cabin and the outer cylinder, the liquid channel G is communicated with the liquid channel F through the cooling liquid outlet, the cooling liquid channel comprises the liquid channel F, the liquid channel G, the cooling liquid inlet and the cooling liquid outlet, and the front end opening of the liquid channel G is arranged at a drill bit.
Further, the pressure relief module comprises a connecting pipe and a lock pin, the front end of the connecting pipe is connected with a lock shell, the rear end of the connecting pipe is connected with a lock body, the rear end of the lock pin is connected with a locking rod, the rear section of the central rod penetrates through an inner cavity of the lock pin, the lock pin is arranged in the connecting pipe, a liquid channel C is arranged between the rear section of the central rod, the lock pin and the locking rod, an inflow hole is formed in the side wall of the locking rod, the liquid channel B is communicated with the liquid channel C through the inflow hole, the liquid channel C is communicated with the liquid channel D, the connecting pipe comprises a pressure relief section and a flow blocking section from back to front, the lock pin is in sealing fit with the flow blocking section, the inner diameter of the flow blocking section is smaller than the inner diameter of the pressure relief section, the pressure relief section is provided with a pressure relief hole, the pressure relief hole is a through hole, there is the shearing plunger in the liquid way B, the shearing plunger internal diameter is greater than lockpin and locking lever external diameter, the shearing plunger is through ending the shearing pin and be connected with the lock body, the shearing plunger is from the back to the front including shearing section and recoil section, shearing section outer wall and the sealed cooperation of lock body inner wall, recoil section external diameter equals pressure release section pressure release hole front portion internal diameter, before stopping drilling, recoil section front end is in pressure release hole front end place ahead, recoil section and pressure release section pressure release hole front portion sealed cooperation, after stopping drilling, the place ahead liquid backward flow strikes the shearing plunger front end, the shearing plunger moves backward, recoil section front end is behind pressure release hole front end, liquid way B communicates with the pressure release hole.
Further, the outflow holes A are inclined from inside to outside to front, a plurality of outflow holes A are formed, and the plurality of outflow holes A are uniformly distributed along the radial circumference.
Further, the inflow holes are multiple, and the inflow holes are distributed in front and back on different sides.
Further, the width of the liquid channel E is smaller than that of the outflow hole B, and the width of the liquid channel E is smaller than that of the driving liquid channel.
Further, the driving liquid channel is narrowed at a driving liquid outlet, the driving liquid outlet faces radially, and the driving liquid outlet is arranged behind the fidelity cabin.
The invention has the following beneficial effects:
1. before starting, the connecting rod is fixed by the shear pin, the outflow hole is sealed in the sealing section A, the outer wall opening of the outflow hole is sealed, liquid cannot flow out, when the hydraulic pressure provided by the rear slurry pump reaches a starting value, the shear pin is broken, the locking rod moves forward, the liquid flows through a liquid flow channel formed by the outer wall of the rear section of the central rod, the inner wall of the connecting section and the inner wall of the liquid outlet section, enters the liquid flow channel formed by the inner wall of the liquid flow channel section and the outer wall of the inflow section through the outflow hole, and is communicated with the front hydraulic motor and the drill bit of the drilling machine, and the hydraulic motor is started to cool the drill bit of the drilling machine;
2. before drilling stopping, the locking ball is arranged in the locking hole A and the locking groove A to lock the valve shell, the liquid channel D is kept to be communicated with the front hydraulic motor through the outflow hole B, when the outer cylinder moves forwards to a stopping position, the outer cylinder drives the safety gear to impact the locking sleeve to enable the locking sleeve to move forwards, the locking groove B is opposite to the locking hole A to release the radial constraint of the locking ball, the liquid impacts the rear end of the valve shell, the locking ball is extruded into the locking groove B, the valve shell moves forwards, the sealing section C cuts off the liquid channel D from the outflow hole B, the forward Fang Mada energy supply is stopped, the motor stops rotating, the shearing plunger is stressed backwards due to the blocking of the liquid channel D, the liquid flows back to the liquid channel B, the back flushing shearing plunger front end is moved backwards, the front end of the back flushing section moves to the back of the pressure release hole, the liquid channel B is communicated with the outside through the pressure release hole, and the liquid is discharged from the pressure release hole;
3. the width of the liquid channel E is smaller than that of the outflow hole B, the width of the liquid channel E is smaller than that of the driving liquid channel, after the liquid channel E is split, the driving liquid channel is high in hydraulic pressure, so that a motor is driven, the cooling liquid channel is low in hydraulic pressure, only a small amount of drilling liquid reaches the drill bit, surface water at the drill bit is in underbalanced backflow, the surface water cleans the rock core, the rock core is prevented from being polluted by the drilling liquid, and the rock core is stable;
4. the driving liquid channel is narrowed at the driving liquid outlet, so that the driving liquid is collected at the outlet, the driving liquid outlet faces radially, the driving liquid is prevented from being sprayed forwards, the driving liquid outlet is positioned behind the fidelity cabin, after the driving liquid is sprayed out of the driving liquid outlet, the driving liquid is flushed backwards, and a large amount of driving liquid is prevented from polluting the core.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is an enlarged view of the portion A before the actuation of the shear pin;
FIG. 3 is an enlarged view of the A section after the actuation shear pin is sheared;
FIG. 4 is an enlarged view of section C before drilling stop;
FIG. 5 is an enlarged view of section C after drilling stop;
fig. 6 is an enlarged view of the portion D;
fig. 7 is an enlarged view of the portion E;
FIG. 8 is a schematic view of a drill bit;
FIG. 9 is an enlarged view of section B before drilling stop;
FIG. 10 is an enlarged view of section B after drilling stop;
in the figure: 1-center rod, 11-center rod rear section, 12-center rod front section, 121-coolant outlet, 2-outer barrel, 21-safety gear, 211-chucking section, 212-pressing section, 22-drill bit, 221-blade, 3-fidelity cabin, 41-drive fluid channel, 411-drive section, 412-drive fluid outlet, 42-coolant channel, 421-coolant channel front opening, 431-fluid channel A, 432-fluid channel B, 433-fluid channel C, 434-fluid channel D, 435-fluid channel E, 436-fluid channel F, 437-fluid channel G, 51-locking lever, 511-connecting section, 5111-actuation shear pin slot, 512-outflow section A, 5121-outflow hole A, 513-sealing section B, 514-inflow section A5141-inlet opening, 52-lock body, 521-locking section, 5211-actuating shear pin opening, 522-sealing section A, 523-fluid path section, 53-actuating shear pin, 54-lock nut, 541-securing section, 542-threaded section, 55-sealing steel ring, 56-securing screw, 61-valve housing, 611-sealing section C, 612-guiding section, 613-locking section A, 6131-locking groove A, 62-locking housing, 621-inlet section B, 622-outlet section B, 6221-outlet opening B, 623-locking section B, 6231-locking opening A, 6232-locking opening B, 63-locking sleeve, 631-impact section, 632-locking section C, 6321-locking groove B, 6322-locking groove C, 64-locking ball, 65-fixed ring, 66-limit head, 661-locking groove D, 662-cooling liquid inlet, 67-snap ring, 71-lock pin, 72-connecting pipe, 721-pressure release section, 7211-pressure release hole, 722-choke section, 73-shear plunger, 731-shear section, 732-recoil section, 74-end shear pin.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, the drilling fluid channel structure of the core drilling machine disclosed by the invention comprises a fluid channel starting module, a pressure relief module, a diversion and flow blocking module, a driving fluid channel 41, a cooling fluid channel 42 and a central rod 1, wherein the fluid channel starting module, the pressure relief module and the diversion and flow blocking module are sequentially connected from back to front, the central rod 1 passes through the fluid channel starting module, the pressure relief module and the diversion and flow blocking module, the central rod 1 comprises a central rod front section 12 and a central rod rear section 11, the diversion and flow blocking module is connected behind the driving fluid channel 41 and the cooling fluid channel 42, the driving fluid channel 41 comprises a driving section 411, the driving section 411 is arranged between a driving motor stator and a rotor, the driving fluid channel 41 is provided with a driving fluid outlet 412, the driving fluid outlet 412 is arranged in front of the driving section 411, the driving fluid channel 41 is narrowed at the driving fluid outlet 412, the driving fluid outlet 412 faces the radial direction, the driving fluid outlet 412 is arranged behind a fidelity cabin 3, the cooling fluid channel 42 passes through an interlayer between the fidelity cabin 3 and the outer barrel 2, the front end of the outer barrel 2 is connected with a drill bit 22, and the opening of the front end of the cooling fluid channel is arranged at the side wall piece of the drill bit 22.
As shown in fig. 2 and 3, the hydraulic channel starting module comprises a lock body 52, a locking rod 51 and a starting shear pin 53, the lock body 52 is communicated from front to back, the locking rod 51 and the lock body 52 are connected through the starting shear pin 53, the lock body 52 is sequentially provided with a locking section 521, a sealing section A522 and a hydraulic channel section 523 from back to front, the outer wall of the locking section 521 is provided with a starting shear pin hole 5211, the starting shear pin hole 5211 is a through hole, the length of the starting shear pin 53 is larger than the depth of the starting shear pin hole 5211, the locking rod 51 is communicated from front to back, the locking rod 51 is arranged in the lock body 52, the locking rod 51 is sequentially provided with a connecting section 511, an outflow section A512, a sealing section B513 and an inflow section A514 from back to front, the connecting section 511 is in threaded connection with the outflow section A512, the sealing section B513 and the inflow section A514 are welded, the outer wall of the connecting section 511 is provided with a starting shear pin groove 5111, the starting shear pin 53 is an annular groove, the starting shear pin 53 is arranged in the starting shear pin hole 5211 and the starting shear pin hole 5211, the inner diameter of the locking section 521 is larger than the inner diameter of the sealing section A522, the outer wall of the connecting section 511 is provided with a step, the outer diameter of the step is larger than the inner diameter of the sealing section A522, the outer diameter of the front part of the step of the connecting section 511 is equal to the inner diameter of the sealing section A522, the starting shear pin groove 5111 is arranged on the outer wall of the step, the rear section 11 of the central rod is arranged in the locking rod 51, the inner diameter of the liquid channel section 523 is larger than the outer diameter of the locking rod 51, the inner diameters of the connecting section 511, the outflow section A512 and the inflow section A513 are larger than the outer diameter of the rear section 11 of the central rod, the sealing section B513 is in sealing fit with the rear section 11 of the central rod, a liquid channel A431 is arranged between the rear section 11 of the central rod and the locking rod 51, the liquid channel A431 is arranged behind the sealing section B511, the rear end of the locking rod 51 is opened behind the liquid channel A431, the side wall of the outflow section A512 is opened with the outflow hole A5121, the outflow hole A5121 is inclined from inside to outside, a plurality of outflow holes A5121 are uniformly distributed along the circumference at the same axial position, the outflow holes A5121 are communicated with the liquid channel A431, the sealing section A522 is in sealing fit with the sealing section B513, the liquid channel B432 is arranged between the lock body 52 and the locking rod 51, the liquid channel B432 is arranged in front of the sealing section A522, the axial distance from the front end of the sealing section A522 to the rear end of the lock body 52 is smaller than the axial distance from the front end of the sealing section B513 to the rear end of the lock body 52, the starting shear pin 53 penetrates through the starting shear pin hole 5211 to be embedded into the starting shear pin groove 5111, the axial distance from the opening of the outer wall of the outflow hole A5121 to the rear end of the lock body 52 is smaller than the axial distance from the rear end of the liquid channel section 523 to the rear end of the lock body 52, the locking nut 54 and the sealing steel ring 55 are further included, the sealing steel ring 55 is connected with the lock body 52, the inner wall of the rear section of the sealing steel ring 55 is contacted with the outer wall of the lock body 52, the inner diameter of the rear section of the sealing steel ring 55 is smaller than the outer diameter of the lock body 52 in front, the inner diameter of the front section of the sealing steel ring 55 is gradually increased from rear to front, the included angle between the inner wall of the front section of the sealing steel ring 55 and the radial section is 45 DEG, the locking nut 54 is behind the sealing steel ring 55, the locking nut 54 compresses the sealing steel ring 55, the lock nut 54 is penetrated from front to back, the rear section 11 of the center rod passes through the inner cavity of the lock nut 54, the front end of the lock nut 54 is in threaded connection with the rear end of the lock body 52, the starting shear pin hole 5211 is formed at the threaded position of the rear end of the lock body 52, the radial distance from the inner wall of the lock nut 54 to the bottom of the starting shear pin groove 5111 is not smaller than the length of the starting shear pin 53, the lock nut 54 comprises a fixing section 541 and a threaded section 542, the outer diameter of the step rear part of the connecting section 511 is smaller than the outer diameter of the step part of the fixing section 541, the inner diameter of the threaded section 542 is equal to the outer diameter of the locking section 521, the lock nut 54 is axially provided with a fixing hole A, the fixing hole A is a through hole, the rear end face of the lock body 52 is provided with a fixing hole B, the fixing hole B is a blind hole, the fixing hole A is matched with the fixing hole B, the fixing screw 56 is in the fixing hole A, the length of the fixing screw 56 is larger than the depth of the fixing hole A, the front end of the fixing screw 56 passes through the fixing hole A and is embedded in the fixing hole B, after liquid is supplied, the locking rod 51 moves forward, the starting shear pin 53 shears, the starting shear pin head is arranged in the starting shear pin hole 5211, the starting shear pin tail 5111 is arranged in the starting shear pin groove, the starting shear pin head comprises a big head and a small head, the big head is outwards, the outer diameter of the big head is larger than that of the small head, the starting shear pin hole 5211 comprises an outer section and an inner section, the outer section aperture is not smaller than that of the big head of the starting shear pin head, the inner section aperture is not smaller than that of the small head of the starting shear pin head, the inner section aperture is smaller than that of the big head, the outer section depth is not smaller than the length of the big head, the sum of the small head and the starting shear pin tail is larger than the depth of the inner section, before the starting shear pin 53 shears, the outlet of the outflow hole A5121 is arranged at the sealing section A522, after the starting shear pin 53 shears, the locking rod 51 moves forward, the outlet of the outflow hole A5121 is arranged in front of the sealing section A522, and the liquid channel A431 is communicated with the liquid channel B432 through the outflow hole A5121.
As shown in fig. 4 and 5, the flow dividing and blocking module comprises a valve shell 61, a lock shell 62, a locking sleeve 63 and a fixing ring 65, wherein the center rod 1, the valve shell 61, the lock shell 62, the locking sleeve 63, the fixing ring 65 and the outer cylinder 2 are coaxial, the rear section 11 of the center rod penetrates through the inner cavity of the valve shell 61, the valve shell 61 is arranged in the lock shell 62, the lock shell 62 penetrates through the inner cavity of the locking sleeve 63, the valve shell 61 comprises a sealing section C611, a guiding section 612 and a locking section a613 from back to front, the outer wall of the locking section a613 is provided with a locking groove a6131, the locking groove a6131 is an annular groove, the lock shell 62 comprises an inflow section B621, an outflow section B622 and a locking section B623 from back to front, the inner diameter of the inflow section B621 is larger than the outer diameter of the sealing section C611, the outer diameter of the sealing section C611 is larger than the outer diameter of the guiding section 612, the inner diameter of the outflow section B622 is equal to the outer diameter of the sealing section C611, a liquid channel D434 is arranged between the rear section 11 of the center rod and the inflow section B621, a liquid channel E435 is arranged between the outer wall of the rear section 11 and the inner wall of the valve shell 61, the rear end of the liquid channel D434 is communicated with the liquid channel B432, the liquid channel E435 is communicated with the liquid channel D434, the liquid channel E435 is communicated with the cooling liquid channel 42, the outflow section B622 is provided with an outflow hole B6221, the outflow hole B6221 is communicated with the driving liquid channel 41, the width of the liquid channel E435 is smaller than that of the outflow hole B6221, the width of the liquid channel E435 is smaller than that of the driving liquid channel 41, the locking section B623 is provided with a locking hole A6231 and a locking hole B6232, the locking hole B6232 is in front of the locking hole A6231, the outflow hole B6221, the locking hole A6231 and the locking hole B6232 are all through holes, the locking holes A6231 and the locking hole B6232 are all provided with locking balls 64, the diameter of the locking balls 64 is larger than the depth of the locking hole A6231, the locking sleeve 63 comprises an impact section 631 and a locking section C632 from back to front, the inner wall of the locking section C632 is provided with a locking groove B6321 and a locking groove C6322, the locking groove 6321 and the locking groove C6322 are annular grooves with the same size, the locking groove C6322 is in front of the locking groove C6321, the distance between the locking groove B6321 and the locking groove C6322 is equal to the distance between the locking hole A6231 and the locking hole B6232, the distance from the bottom of the locking groove A6131 to the inner wall of the locking section B623 is smaller than the diameter of the locking ball 64, the distance from the bottom of the locking groove A6131 to the outer wall of the locking section B623 is not smaller than the diameter of the locking ball 64, the distance from the bottoms of the locking groove B6321 and the locking groove C6322 to the outer wall of the locking section B623 is smaller than the diameter of the locking ball 64, the distance from the bottoms of the locking groove B6321 and the locking groove C6322 to the inner wall of the locking section B623 is not smaller than the diameter of the locking ball 64, the fixed ring 65 is fixed on the outer wall of the locking section B623, the fixed ring 65 is behind the locking hole A6231, the inner diameter of the impact section 631 is larger than the outer diameter of the fixed ring 65, the inner diameter of the locking section C632 is in front of the fixed ring 65, the inner diameter of the outer cylinder 2 is larger than the outer diameter of the lock housing 62 and the locking sleeve 63, the inner wall of the safety gear 21 is connected to the inner wall of the outer cylinder 2, the safety gear 21 comprises a clamping part 211 and a pressing part 212 from the rear to the front, the inner diameter of the front end surface of the extrusion part 212 is smaller than the outer diameter of the impact section 631, the inner diameter of the extrusion part 212 is not smaller than the outer diameter of the fixed ring 65, the inner diameter of the front end surface of the clamping part 211 is smaller than the outer diameter of the rear end surface of the fixed ring 65, the front end of the rear section 11 of the central rod is connected with a limiting head 66, the limiting head 66 is arranged in a locking section B623, the limiting head 66 is arranged in front of a locking section A613, a locking groove D661 is arranged on the outer wall of the limiting head 66, the locking groove D661 is an annular groove, the locking groove D661 is arranged in front of a locking groove A6131, the gap between the outer wall of the limiting head 66 and the inner wall of the lock shell 62 is smaller than the thickness of the front end of the locking section A613, the axial distance from the front end surface of the clamping part 211 to the front end surface of the extrusion part 212 is equal to the axial distance from the center of the locking hole A6231 to the center of the locking groove B6321 before the drilling is larger than the axial distance from the rear end of the sealing section C611 to the rear end of the outflow hole B6221 after the drilling is stopped, the axial distance from the hole center of the locking hole A6231 to the center of the locking groove A6131 after drilling stopping is larger than the distance from the front end of the sealing section C611 to the front end of the outflow hole B6221 before drilling stopping, the lock shell 62 and the valve shell 61 are locked or released by the locking ball 64 in the locking hole A6231, the lock shell 62 and the locking sleeve 63 are locked or released by the locking ball 64 in the locking hole A6231, the lock shell 62 and the central rod 1 are locked or released by the locking ball 64 in the locking hole B6232, the locking device further comprises a clamping ring 67, the outer diameter of the clamping ring 67 is larger than the inner diameter of the fixed ring 65, the inner diameter of the clamping ring 67 is smaller than the inner diameter of the fixed ring 65, the clamping ring 67 is embedded into the clamping groove of the outer wall of the locking section B623, the fixed ring 65 is clamped between the rear end of the clamping ring 67 and the front end of the outflow section B622, the front end of the locking section C632 is supported by a spring, before drilling stopping, the lock shell 62 is locked with the valve shell 61, the front end of the sealing section C611 is positioned at the inflow section B621, the liquid channel D434 is communicated with the outflow hole B6221, the motor rotates, the safety gear 21 is arranged in the outer cylinder 2, when the outer cylinder 2 moves forward to a limiting position, the outer cylinder 2 drives the safety gear 21 to strike the locking sleeve 63, the locking ball 64 in the locking hole A6231 moves outwards, the restriction on the valve shell 61 is released, the valve shell 61 moves forward, the sealing section C611 is in sealing fit with the outflow section B621, the liquid channel D434 is separated from the outflow hole B6221, the liquid channel is driven to be closed, drilling stopping is carried out, at the moment, the locking groove D661, the locking hole B6232 and the locking groove C6321 are opposite, and the locking ball 64 in the locking hole B6232 moves outwards, so that the restriction on the central rod 1 is released.
As shown in fig. 6-8, the front end of the limiting head 66 is connected with a front section 12 of a central rod, a liquid channel F436 is axially arranged in the front section 12 of the central rod, a cooling liquid inlet 662 is formed in the limiting head 66, a liquid channel E435 is communicated with the liquid channel F436 through the cooling liquid inlet 662, the front end of the front section 12 of the central rod is sealed, the front end of the front section 12 of the central rod is connected with a fidelity cabin 3, the front section 12 of the central rod and the fidelity cabin 3 are both arranged in the outer cylinder 2, a cooling liquid outlet 121 is formed in the side wall of the front end of the front section 12 of the central rod, a liquid channel G437 is arranged in an interlayer between the fidelity cabin 3 and the outer cylinder 2, the liquid channel G437 is communicated with the liquid channel F436 through the cooling liquid outlet 121, the cooling liquid channel 42 comprises the liquid channel F436, the liquid channel G437, the cooling liquid inlet 662 and the cooling liquid outlet 121, a cooling liquid channel front opening is formed in the side wall of the drill bit 22, and the blade 221 of the drill bit 22 passes through the cooling liquid channel front opening 421 and the cooling liquid channel front opening 421 is communicated with the liquid channel G437.
As shown in fig. 9 and 10, the pressure release module comprises a connecting pipe 72 and a lock pin 71, the front end of the connecting pipe 72 is connected with a lock shell 62, the rear end of the connecting pipe 72 is connected with a lock body 52, the rear end of the lock pin 71 is connected with a locking rod 51, a rear section 11 of a central rod passes through an inner cavity of the lock pin 71, the lock pin 71 is arranged in the connecting pipe 72, a liquid channel C433 is arranged between the rear section 11 of the central rod and the lock pin 71 and the locking rod 51, an inflow hole 5141 is arranged on the side wall of the locking rod 51, the inflow hole 5141 is arranged in an inflow section A514, a plurality of inflow holes 5141 are arranged on the front and rear sides of the inflow hole 5141, the liquid channel B432 and the liquid channel C433 are communicated through the inflow hole 5141, the liquid channel C433 is communicated with a liquid channel D434, the connecting pipe 72 comprises a pressure release section 721 and a flow blocking section 722 from the rear to the front, the lock pin 51 is in sealing fit with the flow blocking section 722, the inner diameter of the flow blocking section 722 is smaller than the inner diameter of the pressure release section 721, the pressure release section 7211 is arranged on the pressure release section 721, the pressure release hole 7211 is a through hole, the shearing plunger 73 is arranged in the liquid channel B432, the inner diameter of the shearing plunger 73 is larger than the outer diameter of the locking pin 71 and the locking rod 51, the shearing plunger 73 is connected with the lock body 52 through the end shearing pin 74, the shearing plunger 73 comprises a shearing section 731 and a backflushing section 732 from back to front, the outer wall of the shearing section 731 is in sealing fit with the inner wall of the lock body 52, the outer diameter of the backflushing section 732 is equal to the inner diameter of the front part of the pressure release hole 7211 of the pressure release section 721, the front end of the backflushing section 732 is in sealing fit with the front part of the pressure release hole 7211, after drilling is stopped, the front liquid flows back to impact the front end of the shearing plunger 73, the shearing plunger 73 moves backwards, the front end of the backflushing section 732 is behind the front end of the pressure release hole 7211, the liquid channel B432 is communicated with the pressure release hole 7211, and returned driving liquid is discharged from the pressure release hole 7211.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. Drilling fluid channel structure of core drilling machine, its characterized in that: the hydraulic control system comprises a hydraulic channel starting module, a pressure relief module, a flow dividing and blocking module, a driving hydraulic channel (41) and a cooling hydraulic channel (42), wherein the hydraulic channel starting module, the pressure relief module and the flow dividing and blocking module are sequentially connected from back to front, the flow dividing and blocking module is connected to the rear of the driving hydraulic channel and the rear of the cooling hydraulic channel (42), the driving hydraulic channel (41) comprises a driving section (411) and a driving hydraulic outlet (412), the driving section (411) is arranged between a driving motor stator and a rotor, the driving hydraulic outlet (412) is arranged in front of the driving section (411), the cooling hydraulic channel (42) penetrates through an interlayer between a fidelity cabin (3) and an outer barrel (2), the front end of the outer barrel (2) is connected with a drill bit (22), and an opening (421) at the front end of the cooling hydraulic channel is arranged at the drill bit (22);
the hydraulic flow control device further comprises a central rod rear section (11), the central rod rear section (11) penetrates through a hydraulic flow control starting module, a pressure relief module and a flow distribution and flow blocking module, the hydraulic flow control starting module comprises a lock body (52), a locking rod (51) and a starting shear pin (53), the locking rod (51) is arranged in the lock body (52), the locking rod (51) and the lock body (52) are connected through the starting shear pin (53), the central rod rear section (11) is arranged in the locking rod (51), the locking body (52) comprises a sealing section A (522), the locking rod (51) comprises a sealing section B (513), the sealing section A (522) is in sealing fit with the sealing section B (513), a hydraulic flow control A (431) is arranged between the central rod rear section (11) and the locking rod (51), an outflow hole A (5121) is formed in the locking rod (51) and is communicated with the outflow hole A (431), the outflow hole A (431) is formed in the front of the locking rod (51) and is in the sealing section A (522), the sealing section B (522) is in front of the sealing section B (522) and the locking rod (51), the front end of the liquid channel A (431) is sealed, after the shear pin (53) is started to shear, the locking rod (51) moves forwards, the outlet of the outflow hole A (5121) is positioned in front of the sealing section A (522), and the liquid channel A (431) and the liquid channel B (432) are communicated through the outflow hole A (5121);
the flow dividing and blocking module comprises a valve shell (61), a lock shell (62) and a triggering mechanism, wherein a central rod rear section (11) penetrates through an inner cavity of the valve shell (61), the valve shell (61) is arranged in the lock shell (62), the valve shell (61) comprises a sealing section C (611) and a flow guiding section (612) from back to front, the lock shell (62) comprises an inflow section B (621) and an outflow section B (622) from back to front, a liquid channel D (434) is arranged between the central rod rear section (11) and the inflow section B (621), a liquid channel E (435) is arranged between the outer wall of the central rod rear section (11) and the inner wall of the valve shell (61), the rear end of the liquid channel D (434) is communicated with the liquid channel B (432), the liquid channel E (435) is communicated with the liquid channel D (434), the liquid channel E (435) is communicated with the cooling liquid channel (42), the inner diameter of the inflow section B (621) is larger than the outer diameter of the sealing section C (611), the outer diameter of the sealing section C (611) is larger than the outer diameter of the diversion section (612), the inner diameter of the outflow section B (622) is equal to the outer diameter of the sealing section C (611), the outflow section B (622) is provided with an outflow hole B (6221), the outflow hole B (6221) is communicated with the driving liquid channel (41), the front end of the sealing section C (611) is communicated with the outflow hole B (6221) in the inflow section B (621) before drilling is stopped, after drilling is stopped, the sealing section C (611) is matched with the outflow section B (622) in a sealing way, and the liquid channel D (434) is separated from the outflow hole B (6221);
the pressure relief module comprises a connecting pipe (72) and a lock pin (71), the front end of the connecting pipe (72) is connected with a lock shell (62), the rear end of the connecting pipe (72) is connected with a lock body (52), the rear end of the lock pin (71) is connected with a locking rod (51), a rear section (11) of the central rod passes through an inner cavity of the lock pin (71), the lock pin (71) is arranged in the connecting pipe (72), a liquid channel C (433) is arranged between the rear section (11) of the central rod and the lock pin (71) and the locking rod (51), an inflow hole (5141) is formed in the side wall of the locking rod (51), a liquid channel B (432) and the liquid channel C (433) are communicated with a liquid channel D (434) through the inflow hole (5141), the connecting pipe (72) comprises a pressure relief section (721) and a flow blocking section (722) from the rear to the front, the inner diameter of the lock pin (722) is smaller than the inner diameter of the pressure relief section (721), a hole (7211) is formed in the pressure relief section (721), the pressure relief section (7211) is a through hole (432) and the liquid channel B (432) and the inner diameter of the liquid channel B (432) is larger than the inner diameter of the lock pin (73) is equal to the inner diameter of the lock body (73) and is equal to the outer diameter of the lock body (73) and is equal to the inner diameter of the piston (73), the shear plunger (73) comprises a shear section (731) and a backflushing section (732) from back to front, the outer wall of the shear section (731) is in sealing fit with the inner wall of the lock body (52), the outer diameter of the backflushing section (732) is equal to the inner diameter of the front part of the pressure relief hole (7211) of the pressure relief section (721), the front end of the backflushing section (732) is in sealing fit with the front part of the pressure relief hole (7211) of the pressure relief section (721) before drilling is stopped, after drilling is stopped, front liquid flows back to impact the front end of the shear plunger (73), the shear plunger (73) moves backwards, the front end of the backflushing section (732) is behind the front end of the pressure relief hole (7211), and the liquid channel B (432) is communicated with the pressure relief hole (7211);
the outflow holes A (5121) are inclined from inside to outside to front, a plurality of outflow holes A (5121) are arranged, and the plurality of outflow holes A (5121) are uniformly distributed along the radial circumference.
2. The core drill bit drilling fluid passage structure as recited in claim 1, wherein: the valve shell (61) further comprises a locking section A (613), the locking section A (613) is connected with the front end of the diversion section (612), the lock shell (62) further comprises a locking section B (623), the locking section B (623) is connected with the front end of the outflow section B (622), the triggering mechanism comprises a locking sleeve (63), a fixed ring (65) and a safety gear (21), the locking sleeve (63) is arranged in an outer cylinder (2), the lock shell (62) penetrates through an inner cavity of the locking sleeve (63), the inner wall of the outer cylinder (2) is connected with the safety gear (21), the outer wall of the locking section A (613) is provided with a locking groove A (6131), the locking section B (623) is provided with a locking hole A (6231), the locking hole A (6231) is a through hole, the locking ball (64) is larger than the locking hole A (6231) in diameter, the locking sleeve (63) comprises an impact section (65) and a locking section C (632) from back to front, the inner wall of the locking section C (632) is provided with a locking groove B (21), the fixed ring (631) is fixed on the inner diameter of the fixed ring (631) at the front end of the fixed ring (6231) at the front end of the fixed ring (65), the safety gear (21) comprises a clamping part (211) and an extrusion part (212) from back to front, the inner diameter of the front end surface of the extrusion part (212) is smaller than the outer diameter of the impact section (631), the inner diameter of the extrusion part (212) is not smaller than the outer diameter of the fixed ring (65), the inner diameter of the front end surface of the clamping part (211) is smaller than the outer diameter of the rear end surface of the fixed ring (65), the front end of the central rod rear section (11) is connected with a limiting head (66), the limiting head (66) is arranged in the locking section B (623), the limiting head (66) is arranged in front of the locking section A (613), the axial distance from the front end surface of the clamping part (211) to the front end surface of the extrusion part (212) is equal to the axial distance from the hole center of the locking hole A (6231) to the center of the locking groove B (6321), the axial distance from the rear end of the sealing section C (611) to the rear end of the outflow hole B (6221) is larger than the axial distance from the hole center of the locking hole A (6231) to the center of the locking groove A (6131) after the drilling, and the axial distance from the hole center of the locking hole A (6231) to the front end of the outflow hole C is larger than the front end of the sealing section (6231).
3. The core drill bit drilling fluid passage structure as recited in claim 2, wherein: the utility model discloses a drill bit, including main shaft, outer tube (2) and stop head (66), the front end of main shaft is connected with center pole anterior segment (12), there is liquid way F (436) inside axial in center pole anterior segment (12), it has coolant liquid import (662) to open spacing head (66), liquid way E (435) are through coolant liquid import (662) intercommunication liquid way F (436), center pole anterior segment (12) front end seals, center pole anterior segment (12) front end is connected fidelity cabin (3), center pole anterior segment (12) and fidelity cabin (3) are all in outer tube (2), center pole anterior segment (12) front end lateral wall is opened there is coolant liquid export (121), there is liquid way G (437) in the intermediate layer between fidelity cabin (3) and outer tube (2), liquid way G (437) are through coolant liquid export (121) and liquid way F (436) intercommunication, coolant liquid way (42) are including liquid way F (436), liquid way G (437), coolant liquid import (662) and coolant liquid export (121), liquid way G (42) front end opening is in drill bit (22).
4. The core drill bit drilling fluid passage structure as recited in claim 1, wherein: the inflow holes (5141) are multiple, and the inflow holes (5141) are distributed in front of and behind different sides.
5. The core drill bit drilling fluid passage structure as recited in claim 1, wherein: the width of the liquid channel E (435) is smaller than that of the outflow hole B (6221), and the width of the liquid channel E (435) is smaller than that of the driving liquid channel (41).
6. The core drill bit drilling fluid passage structure as recited in claim 1, wherein: the driving fluid channel (41) narrows at a driving fluid outlet (412), the driving fluid outlet (412) faces radially, and the driving fluid outlet (412) is behind the fidelity capsule (3).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811327013.4A CN109403901B (en) | 2018-11-08 | 2018-11-08 | Drilling fluid channel structure of core drilling machine |
| PCT/CN2018/114963 WO2020093411A1 (en) | 2018-11-08 | 2018-11-12 | Drilling fluid channel structure of core drilling rig |
| US17/309,235 US11859450B2 (en) | 2018-11-08 | 2018-11-12 | Drilling fluid channel structure of core drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811327013.4A CN109403901B (en) | 2018-11-08 | 2018-11-08 | Drilling fluid channel structure of core drilling machine |
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| Publication Number | Publication Date |
|---|---|
| CN109403901A CN109403901A (en) | 2019-03-01 |
| CN109403901B true CN109403901B (en) | 2023-11-10 |
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| CN201811327013.4A Active CN109403901B (en) | 2018-11-08 | 2018-11-08 | Drilling fluid channel structure of core drilling machine |
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| Country | Link |
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| US (1) | US11859450B2 (en) |
| CN (1) | CN109403901B (en) |
| WO (1) | WO2020093411A1 (en) |
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| CN109441383B (en) * | 2018-11-08 | 2023-11-10 | 深圳大学 | Drilling control mechanism of core drilling machine |
| CN112160726A (en) * | 2020-08-12 | 2021-01-01 | 中国二十冶集团有限公司 | Soil crushing device for forward circulation slurry retaining wall cast-in-situ bored pile and using method of soil crushing device |
| CN114961617B (en) * | 2022-07-29 | 2022-10-25 | 陕西太合智能钻探有限公司 | Hydrodynamic core drill |
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| Publication number | Publication date |
|---|---|
| WO2020093411A1 (en) | 2020-05-14 |
| US11859450B2 (en) | 2024-01-02 |
| US20220213736A1 (en) | 2022-07-07 |
| CN109403901A (en) | 2019-03-01 |
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